Table 1. Photophysical data of complexes 1–6.

Complex	k r (exp RT, s–1) a	k r (theo, s–1)	k rx/kr1(exp), krx/kr1(theo) b	Φ P (exp, RT) a ΦP(theo) b
1	6.1 × 105	1.1 × 105	—	0.97 (—)
2	5.8 × 105	9.8 × 104	0.95 (0.89)	0.98 (0.88)
3	4.6 × 105	1.1 × 105	0.75 (1.00)	0.55 (0.63)
4	— c	1.9 × 104	— (0.17)	<0.01 (0.16)
5	— c	1.1 × 104	— (0.10)	<0.01 (0.11)
6	3.4 × 105	2.4 × 104	0.56 (0.22)	0.37 (0.57)

^aFrom ref. 7 in 2-MeTHF.

^bTheoretical estimates are presented in parentheses.

^cThe experimental radiative rates could not be determined.